The Suspicions of Mr Whicher: The Murder in Angel Lane

Whicher,retired from the police after his failure to solve the Road Hill House case,encounters Susan Spencer in a rough tavern,seeking her niece Mary,who came to London to find Stephen Gann,father of her baby. Soon afterwards Mary is found slain and the child missing and Whicher offers to help Susan find the killer. The baby is located at a home for unwed mothers,run by Reverend Marlow,who believes Mary went after Stephen,who rejected her. Whicher learns that Stephen's father was hung for murder (imdb)